diff --git a/FlashTools/Assets/FlashTools/Docs/CHANGELOG.md b/FlashTools/Assets/FlashTools/Docs/CHANGELOG.md
index 0368525..96d6170 100644
--- a/FlashTools/Assets/FlashTools/Docs/CHANGELOG.md
+++ b/FlashTools/Assets/FlashTools/Docs/CHANGELOG.md
@@ -1,5 +1,6 @@
 ###### Version 1.3.18
 * Fix frameCount working before Start
+* Fix preview in Unity 2021
 
 ###### Version 1.3.17
 * Fix 2019 warnings
diff --git a/FlashTools/Assets/FlashTools/Scripts/Editor/FTEditor/Editors/SwfClipAssetPreview.cs b/FlashTools/Assets/FlashTools/Scripts/Editor/FTEditor/Editors/SwfClipAssetPreview.cs
index 52b9397..f40db31 100644
--- a/FlashTools/Assets/FlashTools/Scripts/Editor/FTEditor/Editors/SwfClipAssetPreview.cs
+++ b/FlashTools/Assets/FlashTools/Scripts/Editor/FTEditor/Editors/SwfClipAssetPreview.cs
@@ -135,6 +135,9 @@ namespace FTEditor.Editors {
 		public void Shutdown() {
 			_matPropBlock.Clear();
 			_previewUtils.Cleanup();
+		#if UNITY_2021_1_OR_NEWER
+			Cleanup();
+		#endif
 		}
 
 		// ---------------------------------------------------------------------